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參數(shù)資料
| 型號： | XC9511E14SRL |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器內(nèi)置LDO的同時加電壓檢測器調(diào)節(jié)器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大小： | 180K |
| 代理商： | XC9511E14SRL |
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
!
OPERATIONAL EXPLANATION (Continued)
< U.V.L.O. Circuit>
When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by
unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching operation takes place. By releasing
the U.V.L.O. function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the
VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but
causes pulse output to be suspended; therefore, the internal circuitry remains in operation.
#
High Speed LDO Voltage Regulator
The voltage regulator block of the XC9511 series consists of a reference voltage source, error amplifier, and current limiter circuit.
The voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFET, which is
connected to the VROUT pin, is then driven by the subsequent output signal. The output voltage at the VROUT pin is controlled and stabilized
by a system of negative feedback. A stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit
is built-in.
< Reference Voltage Source >
The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator.
< Error Amplifier >
The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of the Pch driver transistor.
<Current Limit Circuit>
The voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. The voltage regulator senses
output current of the built-in P channel output driver transistor inside. When the load current reaches the current limit level, the current limiter
circuit operates and the output voltage of the voltage regulator block drops. As a result of this drop in output voltage, the foldback circuit
operates, output voltage drops further and the load current decreases. When the VROUT and GND pin are shorted, the load current of about
30mA flows.
#
Voltage Detector
The detector block of the XC9511 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally.
(N channel Open Drain Type)
XC9511 Series
Semiconductor Ltd.
Data Sheet
10
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| XC9511F1433 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511F1434 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511F143SRL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511F1463 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511F1464 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
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